Pregnancy glow is the flushed, dewy look many people notice on a pregnant person’s face, caused by a real combination of increased blood flow and higher oil production. It’s not a myth or a compliment people invented to be polite. Measurable changes in your circulatory system and hormone levels create visible differences in your skin, most often during the second trimester.
Why Your Skin Looks Different During Pregnancy
Two things happen simultaneously to create the glow effect. First, your body produces significantly more blood. Plasma volume alone increases by about 1,250 ml during a healthy pregnancy, which is nearly 50% more than your non-pregnant volume. Your heart pumps harder too: cardiac output rises by about 40% to keep up with the demands of a growing fetus. A large share of that extra blood flow goes to organs that need volume rather than extra oxygen, and your skin is one of them. More blood flowing through the tiny capillaries in your face gives your complexion a warmer, rosier tone.
Second, pregnancy hormones push your oil glands into overdrive. The extra sebum coats your skin with a thin, natural sheen. Combined with the increased blood circulation underneath, the result is skin that looks both flushed and luminous. If you’ve ever noticed how your face looks after a good workout, the mechanism is similar, just sustained over weeks and months instead of minutes.
When It Starts and How Long It Lasts
The glow typically becomes noticeable in the second trimester, roughly weeks 13 through 27. This lines up with when cardiovascular changes are peaking. By eight weeks, cardiac output has already jumped about 20%, and it reaches its maximum somewhere between weeks 20 and 28. So the second trimester is when the blood volume increase is most dramatic relative to your baseline, which is why skin changes tend to be most visible then.
That said, some people notice it earlier or later, and some never experience it at all. How obvious the glow appears depends on your baseline skin tone, how much extra oil your glands produce, and whether other skin changes (like breakouts or dark spots) are happening at the same time. The glow generally fades after delivery as blood volume and hormone levels return to their pre-pregnancy state.
Not Everyone Gets the Glow
The same hormonal surge that creates a dewy complexion in some people triggers acne in others. If your oil glands were already active before pregnancy, the extra sebum can clog pores instead of creating a subtle sheen. Breakouts along the jawline and chin are common, especially in the first trimester when hormone shifts are most abrupt. So the “glow” and pregnancy acne are actually driven by the same mechanism, just with different outcomes depending on your skin type.
Other people find their skin becomes drier or more sensitive during pregnancy rather than oilier. Hormonal responses vary widely from person to person and even from one pregnancy to the next.
Pregnancy Glow vs. Melasma
There’s an important distinction between the rosy, even flush of pregnancy glow and a separate condition called melasma, sometimes called the “mask of pregnancy.” Melasma shows up as dark, splotchy patches, usually on the forehead and cheeks, caused by an increase in pigmentation rather than blood flow. Nearly 50% of pregnant women develop some degree of it.
The two look quite different. Pregnancy glow is an overall warmth and shine across the face. Melasma creates uneven, clearly defined darker areas that contrast with the surrounding skin. Sun exposure makes melasma worse because pregnancy already leaves your skin more sensitive to UV light. If you’re noticing dark patches rather than a general flush, that’s pigmentation, not glow, and protecting your skin from the sun can help keep it from deepening.
What You Can Do About It
If you’re enjoying the glow, there’s nothing you need to do. It’s a normal byproduct of healthy circulatory changes. If the extra oil is tipping into breakouts or making your skin uncomfortably shiny, a gentle, fragrance-free cleanser and an oil-free moisturizer can help without stripping your skin. Avoid harsh acne products during pregnancy, since some common active ingredients aren’t considered safe for use while pregnant.
For melasma, the most effective step is consistent sun protection: broad-spectrum sunscreen, a hat, and limiting direct sun exposure during peak hours. Melasma often fades on its own in the months after delivery, though for some people it lingers longer. Treating it aggressively during pregnancy isn’t recommended since the hormonal driver is still active.
The glow is real, it’s temporary, and it’s one of the more welcome side effects of the massive cardiovascular remodeling your body does to support a pregnancy. Whether you experience it as a flattering flush or an oil slick depends largely on biology you can’t control, but understanding the mechanism can at least help you manage whatever version your skin decides to produce.